Skiving-knife.



Patented Oct. 10, 1916.

A. M. ALEXANDER.

SKIVING KNIFE.

APPLICATION FILED DEC. 31, I914- 1,200,570.

INVENTDR WITNESSES W%/mz2' UNITED STATES PATENT OFFICE.-

ALEXANDER M. ALEXANDER, OF BEVERLY, MASSACHUSETTS, ASSIGNOR TO UNITED SHOE MACHINERY COMPANY, OF IA'IERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

SKIVING-KNIFE.

Specification of Letters Patent.

Patented Oct. 10, 1916.

Application filed December 31, 1914'. Serial No. 879,902.

ing-Knives; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will onable others skilled in the art to which it appertains to make and use the same.

The present invention relates to rotary knives and more particularly to cylindrical knives of this type employed in connection with leather skiving and other machines.

One object of the invention is to provide a knife of this type in which the cylindrical knife blade is clamped firmly to the knife holder throughout all portions of the periphery in order to cause the knife blade to assume as nearly as possible a true cylindrical form.

A further object of the invention is to provide a knife of this type in which the knife blade may be conveniently adjusted when desired, and may be completely removed from the holder and replaced by a new blade in a minimum time.

A still further object of the invention isto improve and reorganize knives of this type in order to provide a simple and compact mechanism for manipulating the knife blade and for clamping it in an operative position.

With the above ends in view the various features of the invention consist in certain novel features of construction, combinations and arrangements of parts hereinafter described and claimed the advantages of which will be obvious to those skilled in the art from the following description.

In the accompanying drawings illustrat ing the preferred form of the invention; Figure 1 represents an elevation partly in section of the knife, together with the actu ating and adjusting mechanism; Fig. 2 is a detail showing a plan View of the knife clamping sectors; Fig. 3 is a detail showing a section of the adjusting handwheel; and Fig. 4 is a detail showing a plan View of the hand wheel shown in Fig. 3.

In the present invention certain improvements have been made in the skiving knife.

in order to facilitate the adjustment of the knife blade as the cutting edge is worn away to clamp the knife blade firmly in operative position and to permit the removal of a worn out blade and the insertion of a new one when desired. To this end the knife comprises an external knife holder having a true cylindrical blade engaging surface, a

knife adjusting ring, a knife blade carried by the ring inside of the holder, clamping means engaging with the inside of the knife blade, and an adjusting rod and mechanism for actuating the rod to actuate either the blade clamping means or the knife adjusting ring, as desired.

In the illustrated embodiment of the invention the knife shaft 1 is provided with the usual head 3 to which a knife holder i is secured by a plurality of threaded members 5 having heads 6 which are positioned flush with the inner surface of the knife holder, as shown clearly in Fig. 1. The knife holder is provided with a true cylindrical blade engaging surface and a cylindrical knife blade 8 is supported inside of the holder by a supporting and adjusting ring 10 having a recessed flange 11 which is connected to the knife blade in the usual manner. In order to adjust the knife blade axially of the knife holder the ring 10 is threadedly connected with a rotary head 12 which is loosely journaled upon the hub 1d of the knife shaft and is connected to an adjusting rod 16 through a flanged head 18 supported upon the adjusting rod and a plurality of bolts 19 connecting the two heads 12 and 18. The adjusting ring 10 is locked against rotation relative to the knife holder by the threaded fastenings 5 which have elongated ends 21 passing loosely through the adjusting ring, as shown clearly in Fig. 1 to prevent a rotation of the adjusting ring relative to the knife holder and act as guides for the longitudinal movement of the adjusting ring. I/Vith this construc tion, if the knife holder is locked against rotation the adjusting ring is caused to traverse longitudinally of the knife when the head 12 is rotated. The flanged head 18 is provided with a rectangular slot which fits a corresponding rectangular portion 22 formed upon the end of the adjusting rod 16, thus securing the two members against a relative rotation.

The knife blade is clamped against the knife holder at all portions of the periphery by a plurality of clamping sectors 24, the inner ends of which are supported in an annular recess formed in the flanged head 18 and are retained in assembled position upon the head by a resilient ring 27. The ring 27 is supported in a series of curved recesses formed adjacent the inner end of each of the sectors, which, when the sectors are assembled, forms a continuous annular recess 28. The sectors are engaged by a clamping head 30 which is connected to the end of the adjusting rod 16 through a looking nut 31 threadedly mounted upon the end of the adjusting rod. lVith this construction it will be obvious that a lengthwise movement of the adjusting;- rod and clamping head will serve to rock the several sectors about their inner edges and as each sector has an independent movement all portions of the knife blade will be clamped firmly to the holder. The adjusting rod serves the dual function of actuating both the blade clamping and blade adjusting mechanism, the blade clamping mechanism being operated by a lengthwise movement of the rod and the blade adjusting mechanism being operated by a rotary movement of the rod and the adjusting head 12. These movements are imparted to the rod by a hand wheel 33 supported upon the opposite end of the rod and rotated to either produce an axial movement of the rod or locked against rotation relative to the rod to rotate the rod with the hand wheel. To this end the hand wheel 33 is threadedly mounted upon the outer end of the adjusting red, as shown clearly in Fig. 3 and the latter is provided with a slabbed off portion indicated at 35.

The hand wheel is provided with a locking.

disk 36 adjustably supported upon the hand wheel through the provision of the slot 37 formed in the disk and bolts 38 secured in the hand wheel and projecting through the slot 37. As seen clearly in Fig. 4, the slot 37 extends diametrically across the disk and is provided with an enlarged portion 39 corresponding in diameter to the threaded portion of the adjusting rod 16. lVith this construction, when the disk 36 is located in the position shown in Fig. 4 with the enlarged portion of the slot embracing the adjusting rod the hand wheel may be rotated freely without imparting a corresponding rotation to the adjusting rod, but when the disk 36 is moved into the position shown in dotted lines in Fig. 4, the sides of the slot engage the flat sides of the slabbed off portion 35, looking the hand wheel and adjusting rod against a relative rotation and thus rotating the adjusting rod Without causing any substantial lengthwise movement. The disk 36 is normally retained in either one of the two operative positions shown in Fig. 4 which may be respectively referred to as the clamping and adjusting positions, by a spring pressed ball 40 supported in a recess in the hub of the hand wheel and engaging with cooperating depressions 41 formed in the adjoining face of the disk 36.

The operation of the improved knife adjusting and clamping mechanism is as follows: The knife blade is adjusted by first rotating the hand wheel 33 freely upon the adjusting rod in a direction to permit the release of the clamping sectors 24, after which the hand wheel is locked to the rod by moving the disk 36, and a rotation of the hand wheel then rotates the head 12, causing an axial movement of the knife blade 8. During this adjustment of the knife blade the holder is conveniently held against rotation by a locking plate 45 which is provided with an end 46 projecting into a cooperating slot 48 formed in the knife holder and is connected to the casing of the machine by pins 49. It will be noted that the knife holder 4 is secured to the flanged head 3 0f the knife shaft 1 and that the rotary head 12 and blade adjusting ring 10 carried thereby are supported upon the hub portion of the head 3 and have provision for an axial movement relative thereto. The rotary head 12 is connected to the head 18 carrying the clamping sectors through threaded fastenings 19 in order that the rotary head 12 shall be rotated and moved axially with the head 18. When the hand wheel 33 is threaded forward upon the adjusting rod 16 the clamping head 30 is forced against the clamping sectors 24 and the face of the hand wheel engages with the co-acting face of the driving pulley upon the opposite end of the shaft. lVhen it is desired to remove the knife blade from the holder the hand wheel 33 is threaded baclnvardlv upon the adjusting rod, releasing the clamping sectors and removing the face of the hand wheel from engagement with the face of the driving pulley. After this, the knife blade may be pushed out of the holder by a pressure upon the hand wheel which causes a lengthwise movement of the adjusting rod 16 within the knife shaft, the rotary head 12 relative to the hub upon which it is jour naled, and the blade adjusting ring 10 and blade 4 carried thereby. It will be noted from an inspection of Fig. 1 of the drawings that the rectangular portion 22 of the adjusting rod is sufficiently long to permit a lengthwise movement of the rod relative to the head 18 for a limited distance. After a new blade has been positioned upon the adjusting ring it is conveniently drawn into the holder by threading the hand wheel forwardly, which retracts the adjusting rod, drawing the head 18 and adjusting head 12 therewith, until the head 18 engages with the end of the hub portion of the head 3. Thereafter the adjusting rod is moved for a limited distance relative to the head 18, moving the clamping head 30 to actuate the sectors 24:. g

While it is preferred to employ the specific construction and arrangement of parts shown and described, it will be understood that this construction and arrangement is not essential exceptso far as specified in the claims, and maybe changed or modified without departing from the broader features of the invention.

The invention having been described, what is claimed is 1. A skiving knife, having in combination, a knife blade holder, a knife blade supported inside of the holder, mechanism for adjusting the knife blade lengthwise of the holder, a plurality of independent members for engaging with the interior of the knife blade and clamping it to the holder, and a common actuating mechanism forthe clamping members."

2. A skiving knife, having in combination, a knife blade holder, a knife blade supported inside of the holder, mechanism for adjusting the knife blade lengthwise of the holder, a plurality of clamping sectors inside of the knife blade, mechanism for supporting the sectors independently of one another, and a common actuating means for imparting a blade engaging movement to the sectors.

3. A skiving knife, having in combination, a knife blade holder, a blade supported inside of the holder, a clamping rod, a plurality of clamping sectors supported by the rod independently of one another and operatively connected with the rod, and mechanism for adjusting the rod in a lengthwise direction to impart a blade engaging movement to the sectors.

d. A. skiving knife, having in combination, a knife blade holder, a knife shaft supporting the holder, a knife blade located inside of the holder, mechanism for adjusting the knife blade, mechanism for clamping the knife blade to the holder, a rod extending through the knife shaft, and means under the control of the operator for either rotating the rod or moving the rod in a lengthwise direction to actuate the blade adjusting mechanism or the blade clamping mechanism, respectively.

5. A skiving knife, having in combination, a knife blade holder, a shaft supporting the holder, a knife blade located inside of the holder, a rod, and operative connections between the rod and knife blade for adjusting the blade lengthwise of the holder and for clamping the blade to the holder.

6. A skiving knife, having in combination, a knife blade holder, a blade supported inside of the holder, a knife shaft, a rod extending through the knife shaft and connected with the blade, an operating member mounted upon the rod, and connections between theoperating member and rod under the control of the operator for rotating the rod" orfor moving the rod in a lengthwise direction to either adjust the knife blade or clamp the blade to the holder.

7. Askiving knife, comprising a knife blade holder, a knife shaft supporting the holder, a blade supported within the holder, a'rod extending through the knife shaft, connections between the rod and knife blade toadjust the bladeupon a rotation of the rod, a hand wheel threadedly engaging with the end of the rod, and means for locking the hand wheel against rotation relative to tation' relative to the holder, a rotary adjusting rod, and connections between the rod and adjusting member.

9. A skiving knife, having in combination, a knife blade holder, a knife blade supported inside of the holder, a head, a plurality of clamping sectors supported upon the head independently of one another, a

resilient ring for retaining the sectors in position upon the head, an adjusting rod operatively connected with the clamping sectors, and means for moving the rod in a lengthwise direction.

10. A skiving knife, comprising, a knife blade holder, a blade supported inside of the holder, an adjusting rod operatively connected with the knife blade at one end, a

hand wheel threadedly connected to the opposite end of the rod, a sliding plate arranged to be supported in one of two operative positions in which the hand wheel is locked against rotation relative to the rod or is permitted to rotate freely with relation to the rod, and means for retaining the plate in the operative position into which it is moved.

11. A skiving knife having in combination, knife blade holder, a blade supported inside of the holder, a head having an annular recess, a plurality of clamping sectors having their inner edges supported in the recess, a resilient ring retaining the clamping sectors in position upon the head, and means for rocking the sectors about their inner edges to clamp the knife blade to the holder.

12. A skiving knife, having in combination, a knife shaft, a knife blade holder secured to the shaft, a blade adjusting ring. a knife blade carried by the ring inside of the holder, a rotary adjusting head supported on the end of the knife shaft and threadedly connected with the ring to cause an adjustment of the ring when the head is rotated, and means for normally retaining the rotary adjusting head against axial movement relative to the knife shaft and arranged to permit a bodily axial movement of the rotary head relative to the knife shaft to permit removal of the knife blade from the holder.

13. A skiving knife, having in combination, a knife shaft, a knife blade holder secured to the shaft, a rotary adjusting head supported upon the end of the shaft within the holder, a knife blade operatively connected with the adjusting head, means for normally retaining the head against axial movement relative to the knife shaft and arranged to permit an axial movement of the adjusting head relative to the knife shaft to eject the knife blade from the holder, and

a knife blade, operative connections between the knife blade and adjusting head, an ad j usting rod passing through the knife shaft, and connections between the adjusting rod and rotary adjusting head to cause the head to be rotated and to be moved axially with relation to the knife shaft by the adjusting rod.

ALEXANDER M. ALEXANDER.

Vitneses CHESTER E. ROGERS, E. MARION BLACK.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, I). C. 

